Earht Science
posted by Christine .
To bobpursley,
the half life is 40.(potassium 40)

You are mistaken. Potassium 40 has a halflife of 1.248×109 years. So two halflifes is twice that. You need to learn what the 40 means in Potassium 40
posted by Christine .
To bobpursley,
the half life is 40.(potassium 40)
You are mistaken. Potassium 40 has a halflife of 1.248×109 years. So two halflifes is twice that. You need to learn what the 40 means in Potassium 40